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My hens have always returned to the coops and laid in the nestboxes when free ranged. My very first hens had already learned to use the nestboxes before I ever let them out to free range. Then later hens just learned to do it from the older hens. I have read that some people have problems with free ranging hens laying eggs out on "the range". So it's probably just a learned thing. Every hen has her own favorite spot where she lays her eggs. If that spot is in the coop to begin with, it shouldn't ever be a problem.
If it does become a problem, the obvious solution is to keep them penned in or around the coop for a week or so, until they learn to use the nestboxes.